condition mean min max ZT0-3 0.55927681375 0.3292454675 0.78930816 ZT4-7 0.83099933525 0.5298910685 1.132107602 ZT8-11 3.63932451125 2.2327420065 5.045907016 ZT12-15 5.3719211394999995 4.968678543 5.775163736 ZT16-19 3.39824834625 3.383997399 3.4124992935 ZT20-23 3.1842438415 2.874140012 3.4943476710000003